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In 2014, [[Chuck Hagel]] requested a $1 billion investment in the engine technology.<ref>{{cite web |url=http://www.militarytimes.com/article/20140224/NEWS05/302240043 |title=Pentagon, Air Force doubles down on engine technology |last1=Mehta |first1=Aaron |date=24 February 2014 |website= militarytimes.com |publisher=Gannett Government Media |accessdate=24 February 2014}}</ref> A [[Assistant Secretary of Defense for Research and Engineering|government official]] has warned that [[Budget sequestration in 2013|sequestration]] risks ending the program.<ref name=aw2015-04>{{cite news |first=Graham |last=Warwick |url=http://aviationweek.com/technology/budget-cuts-future-weapons-could-have-long-term-impact |title=Budget Cuts To Future Weapons Could Have Long-Term Impact |work=[[Aviation Week & Space Technology]] |date=3 April 2015 |accessdate=8 April 2015 }}</ref>
In 2016, the Adaptive Engine Transition Program (AETD) was launched with the goal of developing and testing adaptive engines for the future sixth generation fighter programs, Penetrating Counter Air (PCA) for USAF and Next Generation Air Dominance (NGAD) for US Navy, as well as potential re-engining of the F-35. The program assigned the new designations [[XA100]] for General Electric's design and XA101 for Pratt & Whitney's.<ref name="fg20180709">{{cite web |last=Trimble |first=Steven |url=https://www.flightglobal.com/fixed-wing/usaf-starts-work-on-defining-adaptive-engine-for-future-fighter/128748.article |title=USAF starts work on defining adaptive engine for future fighter |work=Flight Global |date=9 July 2018 |access-date=11 January 2020}}</ref>
In 2017, Pratt wrapped up tests of their three stream engine with a F135 core, which may be used on the Penetrating Counter Air (PCA) platform.<ref>{{cite news |url=https://www.defensenews.com/digital-show-dailies/air-force-association/2017/09/18/pratt-whitney-completes-tests-for-new-adaptive-engine-that-could-power-future-fighter/ |title=Eyeing the future fighter, Pratt & Whitney hits milestone with new adaptive engine |last1=Insinna |first1= Valerie |date=18 September 2017 |website=www.defensenews.com |publisher=Sightline Media Group |accessdate=10 August 2018}}</ref>
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